Upgrade SX20 firmware from TC6.2.0 to TC7.3.6

[Oanhtranba01]

I have problem relate upgrading firmware for SX20.

• I got wrong Release Key from TC6.2.0 to TC6.2.0 on Licence Portal and Upgraded the firmware from TC6.2.0 to TC7.3.6. Now SX20 has

  CRITICAL: Valid Release Key

  Missing release key for undefined. The system will not be able to make any calls. Please add a valid release key.
• I downgrade to TC6.1.4 the problem is still. I got Release Key from TC6.1.4 to TC6.3.1 on Licencing Portal.
• I upgrade from TC6.1.4 to TC6.3.1 and then use the Release Key from TC6.1.4 to TC6.3.1.
• Finally, SX20 is still has problem.

How can I resolve this ??

[Anurag Srivastava]

Hello,

If you have tc6.x release key and you are trying to upgrade tc7.x then it will be a issue and you will get the error " invalid release key"

For upgrading to tc7.x you need release key for tc7.x and then it will work properly.

And downgrading to tc6.x again, please try a factory reset and then try again putting the release key and see if it works.

Thanks

Please rate if it is helpful...

[PJMack]

There is no TC7 release key, Cisco stopped requiring release keys after TC6. My guess is you might have used the wrong software, if you had a valid TC6 release key for the crypto software package, and then installed the non crypto package (the difference is the "nc" before the number 6 in the file name), you will get a release key error. Likewise you can't install the nc TC7 if you have a release key for the crypto TC6. 

So for TC7, download and install 

s52011tc7_3_16.pkg

Not 

s52011tcnc7_3_16.pkg